John j



J. J. HOGAN.

(No Model.)

STBAMBOILBR.

Q//n vena? [UNITED STATES 'PATENT A ()rricn JOHN J. I-IoeNjoF'MiD-DLn'rowN, New Yoan-. f

' s TEAM-Bou Elfi.4

sPEcIrxoA'roN forming part' of Letters ratent'iiio. 578,747, datedMarch' 1c, 189,7.

` Q ppiction nea January 1e, 189s. sciemment. (Nomads.)

. l To @Il whom it, may concern:

Be it known that I, JOHN J. HOGAN, a citizen of the'UnitedlStates,residing at Middletown, Orange county, New York, have in- Vented certainnew and useful Improvements in Steam-Boilers, fully described andrepresented in the following specification Vand the accompanyingrawings, forming a part of the same.

. y l I j L 4 1o Thisinvention vrelates tothat class of boilers in whicha horizontal steam-drum in the upper part of the boiler is connected bywa-l ter-tubes 'with a distributing-drum adjacent` i tothefre-grate; andthe invention consistsvv I 5 partly in means .for improvingthedistribution of the heat and its absorption-by the' tubes and partly inmeans for preserving a.

' proper movement of the water with-in the distributing-drum. ,Y 2o Theinvention will be understood by reference to the annexed drawings, inwhich- Figurel is an end elevation with the nearer wallof theboiler-casing removed. Fig. 2 is a sidcelcvation of the .boiler with thesmokepipeattachedand the supports beneath the 'distributing-drumomitted. l1`.ig..3 is a plan of the boiler with the casing andwater-tubes in section upon. line3 3 in Fig.V 1, and Fig, -lf is ahorizontal section of one of thedistrib- 3o uting-drunis on line i 4 inFig. 1.

A designates the steam-drum, and B the distributing-drums, of which twoare shown at opposite sides ofthe grate M and furnace C. Eachdistributing-dron1 is connected with '35 the,stealn-druln-byithreegroups of tubes a l;

c, which are extended from scparaterlongitudinal portionsof thedistributing-drumto separate longitudinal portions of the steam.-)di-u1u. The casing J incloses the boiler adja- 40 cent to the outer4groups yof tubes, and the tubesof the inner group are projected inwardly`from the. distributing-drum, over the grate', and upwardly to.thebottom 'of the steam-d um and conduct the. ascending current bet eensuehdrums-throughthe furnace and lire-box, a's they are' exposed to thegreatest heat of the tire.

lartitions e andfare extended upward and downward', respectively, fromthe distribut- 5o ing andsteainfdrunis lollgitudinally of the boilerbetween the groups of tubes u, b, and

v, iorniinga descending flue E and an ascendingue F. An openingGextendsfrom the`upper'end o f the ascendingilue to the chimney I. i

i The tubes c are preferablyarranged," as

shown in Figs. 1 and 3, to' form a close wall of water-tubes next thecasing to prevent wasteful radiationofA heat. The tubes ct are slopedinwardly and upwardly from the drums 6o B to the bottom of the tire-boxD, and a wallj K, ofrefractory material, like re-brick, is arranged inthe furnace to absorb the heat of .tle fuel and is formed upon its upperside.,

with inclined surfaces adapted to radiateheat Adirectlyto the lowerpartsof tliejftubes; cr.

Fire-doors L are shown in Fig. 1 for introduc" ving fuel to the furnaceat opposite; sides.v of

the wall K, and the same is'thus heatediby lthe beds of fuel at itsadjacent sides andlop- 7.o

erates'powerfully to convey-such .beat inthe most effective manner tothe ascending watertubes, l

The-tubes a` are obviously exposed to thel greatest heat of the lire.The tubes c are ex- `7 5 posed to the gases only after their heat has Vbeen chiefly abstracted, while` the tubes b, which pass throughtheiutermediatellues E,

are at an intermediate temperature. =The tubesfa thus provide eectivelyfor the as- 8o cending current of fluid and the tubes c for thedescending current, while the tubes b are adaptedl to conduct the fluideither upward or downward, according to the lconditions which prevail atany given time. 1 rlhe water-tubes most remote from the fire are'commonly used to convey tothe distributing-drum the descending currentof' fluid; from which drum the water is supplied to the ascendingcurrent which rises' within the 9o hotter tubes. y Heretofore 4a guardor partitiouhas been extended a part of the way downward within the topof the descending drum, ,between the inlets from such groups of tubes,and in some 95 posed to the.directheatofthejirc the ebulition "is,liable t drivetlie wateipward within the 1 oo tubes which are'proyidedfor jf'lownward currents," and`the proper circulatidn within thetubesfistl'iusinipded ,""i'

In the present invention I ani er bledto utilize the direct heat of thefire upon the distributing-drum and to maintain the dcsired movement ofthc water-currents by eX- tending a complete partition g longitudinallyWithin the distributing-drum ncarlyto its opposite ends and introducingthe descending current of fluid upon the rear or colder side of suchpartition. By this construction the water upon the front side onlyxofthe partition receives the heat of the fire, and the outlets of thedescending currents are protected from the rising current of fluid,which is diverted by the partition whollyinto the tubes provided for theascending current, as indicated by the arrows t in Fig. l.

The spaces h shown in Fig. 4 at the ends of the partition g afford afree communication from the rear tothe front side of the same.

The operation of the construction is as follows: The heat of the fuel isabsorbed partly by the wall K and radiated to the tubes a, while theheated gases which rise through the furnace, as indicated by arrows Z inFig. 1,

enter the upper ends of the lues E, as indicated by the arrows m inFigs. l and 2, and pass from the bottom of the same into the fines F, asindicated by arrows n, escaping `finally to the chimney I by thefine-openings G, as indicated by the arrows o in the same figures. Thewater and steam rise in the tubes a and are separated in thedrum A,

where the water-line w is indicated. Such separated water descendsconstantly thro ugh the tubes c, enteringl the drums B upon the outerside of the partition g, as indicated by the arrows p in Figs. 1 and 2,the shell of the drum being broken away at one end to expose thepartition and inlets from the tubes c.

The water received upon the rear side of the partition passes freelythrough the passages' h at the ends of the partition, as shown bythearrows u in Figs.v Zand 4,' and thus replaces that which enters theascending tubes, the lower ends of which are indicated in Fig. fl. Vhe'nthe fire is sufficiently het to generate steam in the tubes b within theintern'iediate fine E, the current passes upwardly in such tubes, l'butwhen the heat generates steam in the tubes a only the tubes b carryadescending current like the tubes c, which enters the tubes a, as shownby arrows t in Fig. l. The tubes a are extended upward above thewater-line of the boiler to discharge their steam withoutobstruetion,but the tubes bare extended upward a part only of the way to thewater-line, that they may carry a downward current when required. Theabove is the normal action when there is in operation, but

a direct draft to the chimney may be secured when kindling the fire by apassage G', leading from the fire-chambcr D into the breeehing H, with adamper NgDFigs. 1 and 2, to open the sanie when required.

The furnace is shown with two grates and fuel-doors L and oneradiating-wall K, located between t-he same; but it is obvious that inboilers of large proportions a greater numas are described herein, andthe partitions e l and f would furnish the double return-fines, whichwould be connected with the chimney by outlet G from the top of theascending Hue, as shown herein. A damper f' may be inserted in theascending fine F, as ,shown in Fig. l, or in the'smoke-outlet Gto checkthe draft when desired, and thusretain theproducts of combustion for alonger tilne'in'contact with the tubes. f

The partition g extended from the topl to the bottom of thedistributing-drum, with passages 'h at one or both ends, is adapted toperform the function described herein in any ing tubes are arranged inlongitudinal groups and connected with longitudinal portions of thedistributing-drum, so that the partition can be inserted between theirinlets. It thus serves to separate the ascending and descending currentswit-hin the distributing-drum and secu res a much more rapid and perfectcirculation of the fluid.

Having thus set forth the nature of my invention7 what I claim hereinisl. In a boiler, the combination, with a steam-drum sustained above thefire-grate, with distributing-drum at the side of the grate, of groupsof water-tubes forming ascending and descending channels for the water,and connected with separate longitudinal portions of thedistributing-drum, and a partition extended from side to side of thedistributing-dru in between the mouths of the ascending and descendingtubes, and arranged with passages 7L between the ends of the partitionand the heads of the drum, the whole arranged and operated as and forthe purpose set forth.

2. In a boiler, the combination, with a steam-drum sustained above thelire-grate, with distributing-drum at the side of the' grate, of threegroups of water-tubes extended from separate longitudinal portions ofthe distribl'lting-druin to separate longitudinal portions of thesteam-drum, substanti lly as set forth, a easinginclosin g the bei leradjacent to the outer groups of tubes, the partitions e and f extendedupward and downward longitndinally of the boiler between the groups oftubes to produce descending and ascending smoke-(lues, a lire-box overthe grate, and the outer flue having the chimney-opening G at the top,as and for the purpose set forth.

S3. In a boiler, the combination, with a steanrdrnrn sustained above thefire-grate, with distributing-drum at the side of the grate, of threegroups of water-tubes connect- IOO IIO

ing the steam and distributing drums and ar- 578,747 l Y i s rangedsubstantially as set forth, va casing in- 'closing the boiler adjacentto the out-er groups of tubes, and the partitions f and c extendedrespectively downward .and upward from the steam and distributing drumsbetween-the groups of tubes and producing descending and ascendingsmoke-fines, a lire-box over the grate, the breeching I-I withHue-openings G and G connecting the ascending flue and the fire-boxrespectively with the breeching, and the dampers N and `f' applied tosuch openings, the whole arranged and operated substantially as hereinset forth.

4L. In a boiler, the combination, with a steam-drum sustained above theregrate,` With distributing-drums at the opposite sides of the grate, ofthree longitudinal groups of svater-tubes connecting each of thedistributin g-drums with the steam-drum, and arranged substantially asset forth, a casing inclosing cending smoke-Hues, a fire-box over thegrate, f

a breeching l-l with line-opening G to such lire-box, and flue-openingsG from the tops of the ascending fines to the said breeching, withdainpers N and f for connecting the fire-box and-the ascendingiuerespectively with the breecliing, the Whole arranged and operated ysubstantially as herein set forth.' l

Init stiniony whereof I have hereunto set witnesses.

, ssj niy-lcg'and in the presence of /two subscribing l JonN J.1-IoeAn.A

Witnesses:

L. LEE, EDW. F. KINsEY.

